Have you ever been curious why you need to go to the doctor for a check up even when you are not sick? It might seem like a waste of time, but the doctor checks on lots of important things to make sure you are growing healthy and strong. Your doctor, also called a pediatrician knows all about children's bodies. Grownups go to a different type of doctor. You don't have to be afraid to go to the doctor's or wonder what will happen. Here is a list of the different things your doctor will do to make sure you are growing up healthy.